The 16 bit computers generation "killed" peacefully the 8 bit computers.
Amstrad couldn't see this move, and released the Amstrad Plus range while it should have got it 16 bited...
(Or added another Z80 to get a 2x8 bit while kereping the Old range compatibility...why not ?)
On the Other Hand, Amstrad was still producing cheap 16 bit PC compatible with pseudo EGA capacity (16 colours) so was actually a 16 bit producer.
See Amstrad PC for more information on Amstrad's ventures into the 16bit world.